AdBlue & SCR Diagnostics in Sunbury-on-Thames
Selective catalytic reduction uses AdBlue to cut NOx emissions on modern diesels. When the system detects a fault, it often starts a countdown to prevent restarting — which needs dealing with promptly.
We diagnose and repair SCR systems legitimately: tanks, pumps, heaters, injectors and NOx sensors.
Common signs
Symptoms worth checking
- AdBlue warning
- ‘No start in X miles’ countdown
- NOx sensor faults
- AdBlue crystals around the dosing injector
What parts of an SCR system can fail
Tank heaters and pumps, level and quality sensors, dosing injectors, NOx sensors and the SCR catalyst itself. Contaminated or crystallised AdBlue causes many issues.
Topping up won’t clear a fault-based countdown; diagnosis is needed.
What we check
- Fault codes and countdown status
- AdBlue quality and level
- Pump and heater operation
- NOx sensor data
- Dosing injector
What we can do
- SCR diagnostics
- Sensor, pump and heater repairs
- Dosing injector replacement
How it works
The process
- 01
Scan.
- 02
Test components.
- 03
Repair.
- 04
Reset and verify.
Why The Factory
Main-dealer capability, independent service
A Master Technician-led workshop with seven mechanical ramps, a dedicated MOT ramp and dealer-level diagnostics. Faults are shown to you and additional work is quoted before it goes ahead.
We stand behind the work we carry out. Parts and workmanship are covered in accordance with your statutory rights and any applicable manufacturer or supplier warranty. Please ask us for details relevant to your repair.
- Dealer-level diagnostics
- JLR AdBlue experience
Free local collection & return
Available by arrangement within approximately five miles of our Sunbury-on-Thames workshop. Further afield? Just ask us.
FAQs
AdBlue / SCR Repairs: your questions answered
Why has my AdBlue warning light come on?
Low level, poor quality fluid or a fault in the SCR system.
Why does my car show an AdBlue no-start countdown?
The system has detected a fault or low level and will prevent restarting once the countdown ends.
What parts of the SCR system can fail?
Pumps, heaters, sensors, dosing injectors, NOx sensors and the catalyst.
Can you diagnose AdBlue sensors and system faults?
Yes.
Do you code out or delete AdBlue?
No. The Factory carries out legitimate diagnosis and repair.
Related services
JLR AdBlue & DPF
Jaguar and Land Rover DPF and AdBlue diagnosis.
DPF Diagnostics & Cleaning
Proper diagnosis of DPF warnings, cleaning and repair — never deletion.
Emissions Diagnostics
MOT emissions failures, smoke and emissions warnings diagnosed.
Need help with adblue / scr repairs?
Send your registration and a quick description on WhatsApp, or call the workshop.
The Factory, Harris Way, Sunbury-on-Thames TW16 7EL